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java+selenium爬取图片签名的方法

本文实例为大家分享了java+selenium爬取图片签名的具体实现方法，供大家参考，具体内容如下

学习记录：

1.注意

对应的版本非常重要,使用selenium得下载与游览器版本相对应的插件，有火狐和谷歌我用的谷歌，贴下谷歌driver的插件

查看谷歌版本：

2.插件存放路径

3.获取签名图片存放路径

4.Controller代码如下

 @ResponseBody
 @RequestMapping(value = "signatureGenerationv")
 public String signatureGeneration(String userName, HttpServletRequest request) throws Exception{
 System.setProperty("webdriver.chrome.driver", ".\\Tools\\chromedriver.exe");
 //初始化一个谷歌浏览器实例，实例名称叫driver
 WebDriver driver = new ChromeDriver();
 // get()打开一个站点
 driver.get("https://www.yishuzi.cn/qianming/");
 //签名
 driver.findElement(By.xpath("//*[@id=\"text\"]")).clear();
 driver.findElement(By.xpath("//*[@id=\"text\"]")).sendKeys(userName);
 //签名配色
 driver.findElement(By.xpath("//*[@id=\"index\"]/div[1]/div/div[4]/div[2]/div/div[7]/div/div/p[2]/a[2]")).click();
 //最大化窗口
 driver.manage().window().maximize();
 Thread.sleep(2000);
 WebElement webElement = driver.findElement(By.xpath("//*[@id=\"SaveImg\"]"));
 //生成签名图片,裁剪图片
 byte[] imageData = BrowserUtil.captureElement(webElement);
 //设置隐性等待时间
 driver.manage().timeouts().implicitlyWait(8, TimeUnit.SECONDS);
 //getTitle()获取当前页面title的值
 System.out.println("当前打开页面的标题是： "+ driver.getTitle());
 //关闭并退出浏览器
 driver.quit();
 //把图片转换成能够在页面直接展示的BASE64Encoder格式
 BASE64Encoder base64Encoder = new BASE64Encoder();
 String img = base64Encoder.encode(imageData);
 return img;
 }

5.BrowserUtil工具类代码

public static byte[] captureElement(WebElement element) throws Exception {
 WrapsDriver wrapsDriver = (WrapsDriver) element;
 // 截图整个页面
 byte[] screen = ((TakesScreenshot) wrapsDriver.getWrappedDriver()).getScreenshotAs(OutputType.BYTES);

 ByteArrayOutputStream out = new ByteArrayOutputStream();
 try {
  BufferedImage img = ImageIO.read(new ByteArrayInputStream(screen));
  ImageIO.write(img, "png", new File("img/imgs/img"+System.currentTimeMillis()+".png"));

  // 获得元素的高度和宽度
  int width = element.getSize().getWidth();
  int height = element.getSize().getHeight();
  // 创建一个矩形使用上面的高度，和宽度
  java.awt.Rectangle rect = new java.awt.Rectangle(width, height);
  // 得到元素的坐标
  Point p = element.getLocation();

  float rate = img.getWidth()/1280;
  BufferedImage dest = img.getSubimage(
   (int)(p.getX()*rate),
   (int)(p.getY()*rate),
   (int)(rect.width*rate),(int)(rect.height*rate));
  ImageIO.write(dest, "png", new File("img/"+System.currentTimeMillis()+".png"));
  boolean flag = ImageIO.write(dest, "png", out);
  byte[] imageData = out.toByteArray();
  return imageData;
 } finally {
  out.close();
 }
 }

6.index.html代码

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>签名生成</title>
 <script type="text/javascript" src="js/jquery-3.3.1.min.js"></script>
</head>
<body>
<div>
 请输入名字:<input type="text" id="userName" name="userName"><input type="button" id="btn" value="生成">
 <!--<img id="img" src="">-->
 <div id="img"></div>
</div>
<script>

 $("#btn").click(function () {
  var userName = $("#userName").val();
  $.ajax({
  url : "signatureGenerationv",
  type : "post",
  // dataType :"string",
  data :{'userName':userName},
  success : function(data) {
   data = data.replace(/\\n/g,'\n')//去换行
   var str = data.substring(0,data.length)
   var base = "data:image/png;base64,"+str;
   var img = new Image();//创建img容器
   img.src = base;
   document.body.appendChild(img);
  },
  error : function(data) {
   alert("失败"+data.responseText)
  }
  })
 })

</script>
</body>
</html>

7.结果图

8.pom包

<!--selenium依赖文件-->
 <!-- https://mvnrepository.com/artifact/org.seleniumhq.selenium/selenium-java -->
 <dependency>
  <groupId>org.seleniumhq.selenium</groupId>
  <artifactId>selenium-java</artifactId>
  <version>3.8.1</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.seleniumhq.selenium/selenium-server -->
 <dependency>
  <groupId>org.seleniumhq.selenium</groupId>
  <artifactId>selenium-server</artifactId>
  <version>3.8.1</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.seleniumhq.selenium/selenium-chrome-driver -->
 <dependency>
  <groupId>org.seleniumhq.selenium</groupId>
  <artifactId>selenium-chrome-driver</artifactId>
  <version>3.8.1</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.seleniumhq.selenium/selenium-chrome-driver -->
 <dependency>
  <groupId>org.seleniumhq.selenium</groupId>
  <artifactId>selenium-chrome-driver</artifactId>
  <version>3.8.1</version>
 </dependency>
 <dependency>
  <groupId>org.seleniumhq.selenium</groupId>
  <artifactId>selenium-htmlunit-driver</artifactId>
  <version>2.52.0</version>
 </dependency>
 <dependency>
  <groupId>com.google.code.gson</groupId>
  <artifactId>gson</artifactId>
  <version>2.8.5</version>
 </dependency>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持谷谷点程序。

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